<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>留言板</title>
</head>
<body>
    <div style="width: 1000px;height: 800px;border: 1px solid grey;">
        <div style="width: 900px;height: 390px; border: 1px solid black; margin: auto;"></div>
        <div style="width: 700px;height: 300px; border: 1px solid yellowgreen;margin: auto;margin-top: 10px;"></div>
        <button style="width: 100px; height: 80px;margin: auto;margin-top: 10px;">发送留言</button>
    </div>
</body>
</html>